Valve.



Patented Dec. 1, 1908.

' of which the State of Pennsylvania,

UNITED STATES PATENT OFFICE.

TIIOMAS REES TARN, OF PITTSBURG, PENNSYLVANIA, ASSIGNOB, BY DIRECT ASSIGNMENTS, TO B. H. JACKSON,

OF PITTSBURG, PENNSYLVANIA.

VALVE No. ooaeou.

Specification of Letters Patent.

Patented Dec. 1., 1,908,

To all whom it may concerm". 4

Be it known that I, THOMAS REES TARN, a citizen of the United States, residing at Pittsburg, in the county of Allegheny'and tainnew and useful Improvements in Valves, following is a specification, reference being had therein to' the accompanying drawing.

My invention relates to improvements in disk valvesand is designed to provide a constructlon whereby a disk valve may be mounted upon its seat within a surrounding case to establish communication from a source of supply through the ports *of the disk with distributing ports and from said ports through an exhaust opening, the valve eing so constructed as to provide at all positions a balancing, pressure whereby it may be 0 erated with a minimum of friction and at a times maintain a fluid tight seat.

Generally'stated the device comprises a ported circular seat, a casing connected therewith and a rotatable disk valve set nicating with t e main supp v and, 4 through the ported disk.

- through the circular face 7 of base 2 and are constructed for a four-way valve,

with the inlet opening and distributing ports uon the seat within the casing provided with a central ressure suppl port commul y and with the chamber intervening between the disk valve and-a supplemental head, with means for exhausting any leaka e from the other side of the head, as I sha more fully hereinafter describe. i Referring to ,the drawings: Fi ure 1 is a view in side elevation of the valve in its normal position. Fi 2 is a horizontal sectional view on the Iine II, II, of Fig. 3. Fig. 3 is a vertical sectional view on the line III, III, of Fig. 2. Fig. 4 is a horizontal sectional view on the-line IV, IV, of Fig. 3.-

Figs. 5 and 6 are diagrammatic views showing the disk set to register with the diflerent ports. Fig. 7 is a sectional view on theline VII, VII, of Fig. 4. a

2 is the ported base of the valve, shown as provided placed in communication with said ports 3 All of said ports 3, 4, 5- and 6 open on a common plane arranged below said face as shown to connect with radially arranged supply, exhaust and distribut' pipes, or in any other suitable manner, epending on the conditions have invented oer-- make communication which the valve is designed.

3, exhaust opening4 5 and 6 adapted to be,

or aipparatuswith which the valve is t-o-be use 8 is a port communicating with fluid supply opening 3 and terminating centrally of the annular face 7 so that it will at all times with the centrally 9. Said located port 17 of the valve disk disk 9 is provided at each side of its center with segmental shaped interior passages 10 terminating in opemngll, 12,'and 11, 12, respectively, adapted to re g'ister with ports 3, 4, 5 and 6, as will be readily understood, to establish the various supply and exhaust circulations incarrying out the The main body portion of disk 9 as shown extends beyond face 7 a suflicient distance to provide a body for passages 10 arfd ports 11, 12, beyond which by a reduced central extension 13, supplemental piston head 14 is rigidly connected. with and maintained beyond the disk, leaving an intervening annular space 15. Piston 14 as shown is preferably provided with one or more packing rings or similar devices 16, and is of a diameter sufiiciently less than the diameter of disk 9 to utilize the excess area of the disk for pressure to keep. it seated upon the face 7..

Pressure communication is at all times maintained in space 15, within the casing, by means of central port 17, extending through the body portion of disk 9 and communicativpglwith chamber 15 by an off-set port 18, as

be readily understood. By this construction pressure is established in said'cham,.. ber at the different positions which the disk may assume. 19 is the casing secured by flange 20 and bolts to the ported base 2, the casing preferably extending beyond face 7 of the base sufiicientl far to provide an annular shoulder 21. Ihe object of this construction is that rotation of the disk 9 on the base will result in even wear throughout its entire surface, and the casing will make atight-sealing connection with base 2. A further feature of advanta e is that the assembling of the parts is facilitated, and central alinement secured. a I

The inner diameter of the casing 19 is madeto conform at its lower portion with the di ameter of disk 9 and at its upper portion with the reduced diameter ofpiston 14', being somewhat in-set as shown for such purpose, corresponding to the difference 111.

AND MESNE functions for i area between the face of disk 9 and piston 14 as statdf The casing 19 is preferably made in one piece,-having7a closing head 22 at one end, through which projects centrally the stem 23 by which the disk is rotated, said stem having secured to its outer portion the operating handle or lever 24, held thereon by nut 25 or in any other suitable manner.

The head 22 is located sufficiently beyond piston 14 to leave an intervening space 26 and is also provided with an outlet opening orport 27, by which any leakage of fluid or vapor beyond the piston isreadily exhausted.

I lightness and cheapness,

that of the it will be seenthat bythe foregoing construction the disk 9 will be always held to its seat by" the excess pressure within chamber 15 due to the greater area of the disk over piston, and such excess area may be regulated to suit the size, pressure or other conditions accompanying the use of the valve. The entire disk with its central portionsl3 and 23 and piston 14 may be readily cast in one piece, thereby securing an approximately uniform thickness of metal to insure good results in casting, with resulting although piston 14 may if desired be made separately and secured on the central stem. I

Within the casing 19 one or more inwardly extending abutments 28 may be provided at suitable positions to engage one or more corresponding abutments 29 of disk 9, so that the extreme rotation of thedisk may be limited or controlled by said abutments making contact. The extreme ositions of the disk are indicated in the diagrammatic views, Figs. 5 and 6. The construction of the dewoe is comparatively simple and cheap; the

arrangement of ports and the construction of the valve as a whole avoids the presence at the outer side of the valve of the main su ply pressure, usually necessary in case of va ves wherein the circulation is bodily through the rotating element; the maintenance of the pressure within the chamber 15 and against the major area of disk 9 is positively secured by the port 17 registering with port 8; the

. parts are few in number, consisting merely of the base, disk and itspiston, the shell, and the .operatinghandle, and the device as a whole has been. found to give excellent results in long continued use under the usual conditions met with inthe use of distributing valves.

. aving described my invention, what'I claim and desire to secure by Letters Patseat communicatin ent, is:

- 1. A valve provided with a circular portedwith a supply opening,

a rotatable hollow isk havin an upper solid Wall and an under wall provided with ports communicating with the hollow interior and mounted on said seat, said disk having a supplemental casing, means communicating upper head ofless diameter, a l

I with the supply opening adapted to establish pressure between the disk and and means for rotating the disk, substantially as set fort I 2. .A valve provided with a circular ported 1 seat communicating with a supply opening,

' a rotatable hollow disk having an upper solid wall and an under wall provided with ports I communicating with the hollow interior and i mounted on said seat, said disk having a su p plemental upper head of less diameter, a

its head,

surrounding casing, said ported seat having and means for rotating as set forth.

4 The combination of a base having a circular face, sizlpply, exhaust and distribution openings lea ing through" said base to its face, a pressure supply port communicating with the supply opening of the base and with the central portion of said face, a rotatable orted disk having a supplemental piston head of less diameter with an intervening 'space, and a central supply port registering with thecentral port in the base and with said space, and means for rotating the disk. 5. In a valve, the combination of a base having a-circular face, radially arranged supply, exhaust and distribution ports openin through said face, a casing secured upon sai base havin a major and a minor internal diameter am? an outer exhaust port, a rstatable ported disk mounted upon said ported base within the casing provided with a supthe disk, substantially pressure cavity,, said disk and base having tablish pressure communication from the supply port of the base to the space between the disk and its piston head, with means for rotating the disk, substantially as set forth.

6. In a valve, the combination of a base havinga circular shouldered face, radially o'rts opening throughsaid face, a casing em-- bracing the shouldered face and secured to the base and having a reduced diameter beyond the base, a rotatable ported disk mounted on the base within the casing provided with a piston of less diameter than the disk and an intervening annular opening, means for maintaining constant pressure communication from the supply port of the fluid pressure between the disk and its head,

plemental' piston head and an intervening centrally arranged registering ports to esarranged supply, exhaust, and distribution base to said intervening annular opening, and having an integral operating stem, said and means for rotating the disk, substandisk and base having centrally arranged tially as set forth. registering orts communicating with the 7. In a valve, the combination of a base area above t e disk and with the su ply port 15 5 having a circular face, radially arranged supof the base, substantially as set fort ply, exhaust and distribution ports opening In testimony whereof I affix my signature through said face, a casing secured upon sai in presence oftwo witnesses.

base having a 'major and a' minor internal THOMAS REES TARN. diameter, a rotatable ported disk having a Witnesses: 4 10 supplemental piston head of reduced area 0. M. CLARKE,

connected with the disk by an integral stem I CHAS. S. LEPLEY. 

